Tiffany does seem to be on a curve of incremental improvement; better performances, more consistent, doing a bit better each time against a new level of opponent, and generally making progress.
Not to be today, but if she can reinvest this into a next time, as she has been, then things should keep looking up.
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Data I post, opinions I offer, 'facts' I assert, are almost certainly all stupidly wrong.
I hope Tiffany herself feels that she is on an upward trajectory. She always tries hard but can suffer from a lack of confidence and let games and matches slip away. She is a tall powerful girl with a good serve and a fair bit of variety and so should do well but sometimes needs a bit more mental steel.